I agree to Brain. There is no harm in sharing knowledge.
I have seen people asking question which is no were realted to SEP or Symantec but we still answer them (only if we can).
I myself have conducted interview for hrining engineers for SEP .We used to concentrate on only 2 things
1. basic networking
2. Operating System
Also mainly we used to ask question from the applicants CV based on his work experince.
I never remember asking any questions related to SEP to the candiate as I knew they don't know that.